MAY FLIES AND MIDGES OF NEW YORK 327 



PLATE 31 



1 Metriocnemus flavifrons 



2 Metriocnemus par 



3 Metriocnemus lundbeckii 



4 Metriocnemns ex a git a.'n s 



5 Metriocnemus- atratulus 



6 Chasmatonotus bimaculatus (head of male) 



7 D i a m e s a w a 1 1 1 i i (antenna of female) 



8 Orthocladius absurdus (antenna of female) 



9 A part of an egg string of Sphaeromyas argentatus 



10 An egg mass of C h i r o n o in u s sp. x2 



11 An egg mass of T a n y p u s sp. (after Miall) 



1 2 A part of an egg string of Chironomus sp. 



13-14 A part of the egg string of Chironomus dor sal is (after 

 Miall and Hammond) 



15 A part of an egg string of Chironomus sp. 



16 Dorsal aspect of thorax of a male Chasmatonotus bimacula- 



tus. x40 



PL ATE. 32 



Genitalia : d, dorsal keel : 1, lateral ; s, superior ; i, inferior lobe 



1 Bezzia setulosa. Dorsal aspect. Male. xlOO 



2 Tanypus culiciformis. Male. xlOO 



3 Ablabesinyia monilis. Male. xlOO 



4 Corynoneura celeripes ( after Kieffer ) 



5 D i a m e s a p r a e c o x ( after Kieffer ) 



Chasmatonotus bimaculatus. Dorsal aspect. Male. x50 



7 Chironomus f 1 a v i c i n g u 1 a . Dorsal aspect. Male. xlOO 



8 Chironomus modest us. Dorsal aspect. Male. xlOO 



9 Chironomus m o d e s t u s var. b. Latero- ventral aspect. Male. 



xlOO 



10 Chironomus f u 1 v i v e n t r i s. Male. xlOO 



11 Chironomus modestus. Female. xlOO 



12 Chironomus f lav us. Ventral aspect. Male. xlOO 



13 Chironomus decor us. Dorsal aspect. Male. xlOO 



14 Diainesa waltlii. Dorsal aspect. Male. x50 



PLATE 33 



Genitalia : d, dorsal keel ; 1, lateral lobe ; s, superior lobe ; i, inferior 

 lobe; a, appendage of the superior lobe 



1 Orthocladius kervilli (after Kieffer) 



2 Cricotopus e,x i 1 i s . Male. xlOO 



3 Tanytarsus d i s s ; ni i 1 i s . Ventral aspect. Male. xloO 



4 Tanytarsus exiguus. Ventral aspect. Male. x350 



4a Tanytarsus exiguus. Male. Latero-ventral aspect. xlOO 



5 Tanytarsus dives. Male. Dorsal aspect. xlOO 



6 Metriocnemus par. Male. Lateral aspect. xlOO 



7 Orthocladius absurdus. Lateral aspect. Female. xlOO 



8 Metriocnemus atratulus (after Kieffer) 



